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Transcriptome sequencing of an Antarctic microalga, Chlorella sp. (Trebouxiophyceae, Chlorophyta) subjected to short-term ultraviolet radiation stress

  • 9th Asia Pacific Conference on Algal Biotechnology - Bangkok
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Abstract

Stratospheric ozone depletion has led to increasing levels of ultraviolet radiation (UVR) reaching the Earth’s surface. Elevated UVR, particularly in the high latitudes, potentially causes shifts in species composition and diversity in various ecosystems, consequently altering the biogeochemical cycles. Microalgae are not only ecologically important as primary producers, generating atmospheric oxygen and sequestering carbon dioxide; they are also economically important as sources of health supplement, pigments, biofuel and others. Changes to the size and composition of algal communities can lead to profound impacts to the fisheries productivity. There have been studies on the effects of UVR on the growth, photosynthesis and biochemical composition of microalgae, but limited information on the underlying molecular mechanisms involved in the response and adaptation of microalgae to UVR is available. We employed RNA-seq to quantitatively evaluate and compare the transcriptomes of an Antarctic freshwater Chlorella sp. grown at ambient versus elevated UVR conditions. Differentially expressed genes, relating to the fatty acid degradation, amino acid metabolism, starch and sucrose metabolism and peroxisome pathways, suggest conservation and remobilisation of energy resources, maintenance of newly synthesised protein and inhibition of protein degradation, ensuring membrane lipid homeostasis and regulating antioxidative mechanisms, as the acclimation strategies in response to UVR. These findings expand current knowledge of gene expression in polar Chlorella sp. in response to short-term UVR. Studies on stress tolerance mechanisms are important to understand and predict future impacts of climate change. Genes, proteins and pathways identified from these adaptable polar algae have potentially far-reaching biotechnological applications.

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Acknowledgements

We thank Jeannette Wai-Shan Lai for her help with the physiological data. This study was supported by a Higher Institution Centre of Excellence (HICoE) grant (IOES-2014H) from the Ministry of Higher Education, Malaysia; a University of Malaya Research Grant (RP002C-13SUS); the Antarctic Flagship Project (FP0712E012, PV002-2015) by the Ministry of Science, Technology and Innovation (MOSTI), Malaysia; and the Ministry of Science and Technology, Taiwan, R.O.C. (MOST 104-2627-B-019-003).

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  1. Institute of Ocean and Earth Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Sze-Wan Poong, Phaik-Eem Lim & Siew-Moi Phang

  2. Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Siew-Moi Phang

  3. School of Health Sciences, International Medical University, 57000, Kuala Lumpur, Malaysia

    Chiew-Yen Wong

  4. National Antarctic Research Centre, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Chiew-Yen Wong

  5. Department of Computer Science and Engineering, National Taiwan Ocean University, Keelung, Taiwan, Republic of China

    Tun-Wen Pai, Chien-Ming Chen, Cing-Han Yang & Chun-Cheng Liu

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Poong, SW., Lim, PE., Phang, SM. et al. Transcriptome sequencing of an Antarctic microalga, Chlorella sp. (Trebouxiophyceae, Chlorophyta) subjected to short-term ultraviolet radiation stress. J Appl Phycol 30, 87–99 (2018). https://doi.org/10.1007/s10811-017-1124-4

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